remove useless variable declaration, and some cosmetic changes

shaargem.php

@@ -9,7 +9,6 @@ use Shaarli\Config\ConfigManager;
 use Shaarli\Plugin\PluginManager;
 use Shaarli\Render\TemplatePage;
 
-static $redirect_counter = 0;
 /**
  * In the footer hook, there is a working example of a translation extension for Shaarli.
  *
@@ -20,7 +19,6 @@ static $redirect_counter = 0;
  */
 const EXT_TRANSLATION_DOMAIN = 'shaargem';
 
-
 /*
  * This is not necessary, but it's easier if you don't want Poedit to mix up your translations.
  */
@@ -203,3 +201,4 @@ function fetch_iri_title($iri)
 	return $title[1];
 	}
 }
+